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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea3fa2731910258455b7bd25e97fca725012008b64abbeef792e3332b4df34b' 
  AND token = '4uOuuL1SAd8wqMhgOcRU616Rh1PWnSem6aSYtlknARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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