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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbee50c8c8416974f34690c4528702ebcea05bc3af2372031843cbd3b39783f0' 
  AND token = 'l82LYR0fcUnat9/k/0zqbIXib7BAam0NbfAyXNsg1nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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