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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfab3ef20d364cc41f241244d79a9cd0ebabf0ba77f5293cecfd7808005fcad3' 
  AND token = 'bjdNWn4JNSUQi6yFpotCkbKjaf48YWKi2GrkJ8LB1/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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