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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987856d320fec10c72b95bcf683d75a0c9076a7d495f9743864822390498187b' 
  AND token = 'NdpkFO/j/ie22k83H8kkFb1kI7trKgdNr1oNup+un6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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