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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9bad172c5f31826ead87f417eb4362162ffcad47378ec30ef766dd4ebe0b40' 
  AND token = 'ryqa70lTK8IB1iizj77CNmMyS7dYkWJXXcdZ7VskVgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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