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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91634a0aa37e96614c21f936eec951b6866fa55af155a943751118ef968798a5' 
  AND token = 'km1UKpvArQ83Yc1jnllMFQ41cUkjT2o/Qv0+YRRf/EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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