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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02e8435ce7b5599a2a4eefed08be429c3d26e6d53c07ff6200a3e49f04af493' 
  AND token = 'qU6DilchMdZN1x3k60Jd5PIDeiwgF5HCK+EtRMvmzgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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