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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3534e4111d0b4d71374357e58f7b2a087e198407c98c4d1ff680f449631c78cf' 
  AND token = 'e/jD97FSJzLUAQCWwVO4w1AbAOJJX6fJUS97TDrEVWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}