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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4123661fb86e0dd8e6d000ea68564e6a47ad69584c8482d5e069a3fc69817906' 
  AND token = '2muuuDVV9B2DwXtmbs0ceuCmWIlS5YWr0q/yna2lcR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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