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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e77816144a025a74af483bddd444d96b4ff9b8ed61255e17a51293f574590a' 
  AND token = 'o54xBDviYZ2iY/sKwOwdAoVRi61Hph19D8VM5BFDolk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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