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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d1059b137438867b40b4c154980b3a632ad5acf5517049a6b78150d03fe191' 
  AND token = '8xCPTr1nz2wJH1p4p9QqDud6gkfoBiT1tG4zyqqB4kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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