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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375c2276863c2b2216f0bf81d2c5ca1ad702c81b208b9e48936547a13bff0979' 
  AND token = '9/dvxk4w/g2Qs098X8ircq6PCaqjiPKCkql/U//TUig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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