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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd57f9c19419c430f294e5bb8a5aa3692fe688302b3223cbb25e61554f59fe40' 
  AND token = 'HnfT6//+BswHw/y41Fddo1Lbt/5icYOOLwwJG3/gFFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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