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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b757bbf6eb2040254c876ddd0ba4bc377df5cf7a0105c48c9a4903eacd9e6d' 
  AND token = 'o24p7opfdPgD0RhxYeT+B4cHEyAFgyjvjOlSstaNVW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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