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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f922150a712c826374421a16743fa3823f6151eefb0c1002bfa1b600c5f6bef' 
  AND token = '70Nq6dm3Rt4DFRkic3i333YQ9HmqDM6IyJ/+uqvgdtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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