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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3097c02810b69ec8d00d3b995514be275965ee557b43927d88e7cbf30d149b64' 
  AND token = 'VaA6Aaok2/kG9TQ9Bz3cITAhrEpaHFc5/557DBie7AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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