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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28acfd8c5bafe9026a90eb837afd7b4690143b6caa0168b604f30b277d6c0f4' 
  AND token = 'FFQuixw8nmA7HB9ZuImYtNaDeRXS6+jHmlop7xLKYEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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