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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831402ca50818f9c90224c2aa53543ae71e39a79bb7a5d9e22555e53b184333a' 
  AND token = 'mjI4Gn21z583r38WmFW9jcXxOSqeVu9hs4OUCBo8P28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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