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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8586baedc8fc6b4e0d4cf29f70ee948878bd660f82caba4601e9c4f18f4b68c1' 
  AND token = '6DgBPEnLoyBR26FYNahmhYjCRct74iywtetUSW48kuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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