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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0223848f37ee84a78b676ca1e99e304498ae7fc2a10a21f3d503c6298f80d094' 
  AND token = 'h7cJTqzWHjCMvdZrPnSBHumhZW8IP90Ltt3Ql83FnMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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