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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ed815597970eda562f945e2a407517bc4f59a8bba15e705952262dec99235c' 
  AND token = 'jLZ7elXS6xNsPQEAkBFBpLtrQ2fa0CeUnJH8EoVh3Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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