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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a92b5d0a9ff2450f73a88bc69f840653bc52c69dd6a998afc96a75632d84016' 
  AND token = 'zZRr6+lI69+9fY/uOT8VMZyzn3JjetgbuGkaC47N29Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00140

JSON explain

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