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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869fa8fe8cd7a236f24aba65fc54d06f18cc0b4485f6961d16dd8c2049327796' 
  AND token = 'a0cOiiwbtyBnkU+/XX4TUtW+vhhCYTcEhzUXSg34zes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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