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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18ec1981b221aca106248f2327295a22b6560415e5744ea70501fe14149d53e' 
  AND token = '7IDNDvw/beYLVrpu1diDeSb3/TnfW+5tTKo0qkTUSPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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