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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2e6215388a8308eeb1c45c585fc5c4a7492e954bbbd9aa4c4cefc102847d10' 
  AND token = 'mrGuF7/hcfKLdtwJM1Zf2xNk0rWTwSLMZyPQvUIeDFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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