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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5e3d145459124e2030dc2c7c05261ecdaacd096f3ae5514f6aa3b887231df9' 
  AND token = 'Dbkb9XrV8fy209DKDfYlnZqRz36x5S+FSTgP78rXx5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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