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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614a1d986efff66a58b2c2c1fb44fde0bca70d2bce29096a8012140cf481ecb7' 
  AND token = 'UGYPT9V8yQPpgZ7p33me34/k7nhFGkNK6ZoVdKA+nIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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