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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c2d370e299f33503b98cafde37399c000154373eea47f25b9fd54beb2e3dc7' 
  AND token = 'jXTI7gqIf0TSVV/NrS4SFe8L+vtEAjDl5j2M9l5cut8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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