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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0025d62c3d037bdad19b30d2382e2a1d72e4575bee01b2b281aa603cc8542e86' 
  AND token = 't9kIvZPsLH1vOlserAn2972WDiJ7WN2yxjUAIyUchT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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