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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239a246e31287b264ba4d457c3e7163e2050cec1d33977d756fdc84748bab59e' 
  AND token = 'zcyWC3spZby/VGn4KY9zoselwdR8ntdUh2pKT2/bcHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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