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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be834c0bb3ea7ea3eff6bcc190caf3022f94dc554d89439f1b1195e2630f74c' 
  AND token = 'UCP4S8f8+SFy49s1/4gHQVW0oh5ck/APr+SfilQpvj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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