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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b70feb86e0b90791879f8e4c033db6f908a4ac2c6cc78974851110946bcacd' 
  AND token = 'wuU3vxLtVxsCpzczMbEYZQJZSxirVjkS4pbUoMw94+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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