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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2b144dd255e88aa90fd9be8b2e08713430a21b856f9ee963853dd9fa7e985d' 
  AND token = '26tUuaufYx1s2iD9prwc+IrLxCzFeKIcCqoi7GMQF/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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