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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088ea8b6011f072002e7d7ce56eff69cc3811795aa29eb701be3869e5f03e668' 
  AND token = 'bdMzDigAmR1Tyd+8jJO72VPHaTp6jS5yV539r7Tpf1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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