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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be5e0dafc0c70ef3c260019cf56491096cabe31d9ce4f5b4555b72a11b5f518' 
  AND token = 'o1c+vvs+ay4Or69FnISWKzzmQx9zh4XpsUr0TldU42k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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