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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0370dfd2c7402bd65d1d9c10a425e7b41d2c0d0d20883bdd00190ab5f1e051d5' 
  AND token = 'q5PrzHrV91z+c/psSeCc6KWcAtRFyxwsf/cNGpqGlUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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