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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8f633ae8a74cc4531295fb7afc4871885354b25ca1b9f481c6e45f6f527fb9' 
  AND token = 'Pv2+IK7SpXrsfxMC7QeBSW6m8nR+7LdSUZszP2j3+Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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