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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34b1ca9c92c797133c00f11e4ba9eadbaf205338fb9776710b0791d33e1066b' 
  AND token = '+3jx/Cl/t3YArcZtUrS7/L7IJ8Hqk+1yV16lN5wji9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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