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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b038c645937d52bfdb84b7697d73acca348afb74054ef0e99d4cd7169293c637' 
  AND token = 'yF+RBl5bZtSikvq9LFBf2DMm8TriHY5xUaDo48oP6nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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