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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11634d7622ce899b11a49a139bcf03a6748988075cf5188f03246abcc90d89e' 
  AND token = '93vQ4TP8acm++7em9elbAwY4+4We9UFsrFOFNUQwhMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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