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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8437b18d456f18e73fcfa4f9705080e7bdba053fcb3cfa8a413e99cc16246aa' 
  AND token = 'Av3usn0eArz0mcGhGs5bHUVPzEeVQGb4kZ42rh4QC5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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