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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3f9fb060eab79f674b0cc5764c72649cf709673768ca9ba7c9253aee3ad7f0' 
  AND token = 'bh2diaDPbDZx7xNFfJ7L4tWw/b3HFndeGm2cCMgAm4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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