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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d30ff69c116808a73a93e5537349c08097529a1a7df56c4992add87594c373' 
  AND token = 'O3kQNSt0lsUlRkrIY2+BQKHJuIT/bUSYAbzlxBP5FFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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