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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b184aae78957a048b719f5c8fa0c3ece13929a570b87a2d81d729a0444b131' 
  AND token = 'sXmB/11arRPaZ60TlbeXuemFYiaUi9l5OLccQ/VhEgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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