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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ef87e3e88c52c09b61df461b1f8081284830f3dccd0ff5cdf2ba824db5b604' 
  AND token = 'fxqm/UEmxi2b+zwt0VrMTFHa6SbbnEacqGdhzqLjAIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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