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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d88861a87829b3fc2f17f6e5fbb2aea4c13bccd493f6b26c88b8767383d3f2e' 
  AND token = 'PHhxt5iTWWO6J5ji8tgJWPNW3FlabXm8amjm54lZAbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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