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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bfce81142969559012f8cc40a51c12f8e8a47b01d69844fbb837aa50789b1f' 
  AND token = 'IEI0JOtChBZxdwux/xN/90fxPIg4lan2gIb9ZX4aACY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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