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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128cf4c537a8fe61951d4ae2acdd5422949d105e37b4f58530c546a0200e87bb' 
  AND token = 'qK4kD+CD/duHATalsByp0m45rMn9PFaahYLjcrK6i+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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