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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddbbe7ad57d6a683e08abcb06d65319f347898fd821ef7028a63bd5490a2326' 
  AND token = 'WtzvfPdQeayvx2VyovYEtT0hk+6+LAJNQHZWQ/4JTIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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