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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1b082a58622cafc6e43245b81e157d5e98ab491bc0a0d53bde03fc674931c1' 
  AND token = 'X7sVbK9zeXRo96GDhKiTS0gdaxVApC2GP4CYhcxpqAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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