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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f4af1a28b095cdfb658188690ce7b6830e6c613059217510ea5467e1a2d74f' 
  AND token = 'zLtx+PdEjZMkvtiac2XGzvIuuvxpXZbbxZCREtlu8qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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