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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6766b5c8bd82d54518837ec3bfc411f6e1cdbb1eda33a6bb30e871cabcbbcb' 
  AND token = 'y3qrz0L3Vw8eBPGJ1yQqnfjCKUz+z5s4Abc4+VAVZ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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