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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a11e2f0faf489b7edf43d0592b72627a0d6ba05d39f1e0214c1a09e443eadb' 
  AND token = 'AZ2zfGZmQyChD46xi/u0ihhc0o9+v4h3Dm5YkgJoXEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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