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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbafe9a132b1138c05e3c4dcdffb60c2d81a8968e0e8d1d8f9f8884ecb4c90a' 
  AND token = '4atF9BiIlR5sfdFoLwAFCszkG2McH+3a9rQXa2LtbLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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